No friends

i have a friend who does what you're doing but she comes visits our sixthform from time to time, we go out to eat after school; if we go out in a weekend, she joins in; is there no way you can join in?? we always talk about her; even though she isnt in the school anymore. everyone remembers her and we included her in secret santa this year too.
im not sayin you have to do all that and i know its hard to talk to people you think your drifting from, but try using social media to talk, you dont have to always see them. idk how you were in sixthform but my friendship group had 7 people and we all are lowkey seperated but a group of us are together in sixthform but we love and miss our friends very much, especially the one that moved back to italy, but even she is still friends with us by social media and visiting us in december

if you cant make any friends in real life, around your job surrounding, i say try online, i have alot of online friends, who regularly make me feel special, as we share a common interest , its easy to talk

i’ve been in the same situation my advice is too just have no shame almost as things can’t get much worse. Ask when they’re free and organise stuff and don’t give up- if they say they’re going to another thing ask if you could be invited as a plus one or tag along. Maybe try getting a part time job at a place where other teenagers work if you have the time